Think of non‐ essential relative clauses as adjectives describing the noun; you can remove adjectives without changing the meaning of the sentence. A relative clause can be introduced by either a ...

For instance, nouns must match with nouns, adjectives with adjectives ... For number 5, you can choose whether you want to use two prepositional phrases, or two adverb clauses. - The manager praised ...

Note that cruel in the above example is an adjective describing behaviour so the progressive form is used with it. We can use an adverbial participle clause to express reason or cause as an ...